package test;

import java.util.Locale;

public class Example {
    String str = new String("hello");
    char[] ch = {'a','b'};

    public static void main(String[] args) {
        Example ex = new Example();
        ex.change(ex.str,ex.ch);
        System.out.println(ex.str+"and");
        System.out.println(ex.ch);

        int i  = 0;
        Integer j = new Integer(0);
        System.out.println(i == j);
        System.out.println(j.equals(i));

        String x = "fmn";
        x.toUpperCase();
        String y = x.replace('f','F');
        y = y + "wxy";
        System.out.println(y);
    }
    public void change(String str,char ch[]) {
        str = "test ok";
        ch[0] = 'c';
    }
}
